Dr. Michael Perlstein is a podiatrist who owns his own medical practice and goes by the name of Brooklyn Foot Doc. To learn more about him, visit his website: http://www.brooklynfootdoc.com/

John Durant has been taking a paleo approach to health for the past several years. He is a founder of Barefoot Runners NYC and writes about being an urban caveman on his own blog: http://www.hunter-gatherer.com/

Dr. Daniel Lieberman is a professor of evolutionary biology at Harvard University. Not only is he interviewed in the book, his studies greatly contribute to the idea that humans are born to run.

Kathy Martin is a real estate agent who, in her 40s, discovered a gift for running. She has set nine American and two world records in her age group.

Chris McDougall is a journalist and author best known for his book, BORN TO RUN. To learn more about him, his book and the barefoot running debate, visit www.chrismcdougall.com

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